GaOx@GaN Nanowire Arrays on Flexible Graphite Paper with Tunable Persistent Photoconductivity.

Flexible optoelectronic synaptic devices that functionally imitate the neural behavior with tunable optoelectronic characteristics are crucial to the development of advanced bioinspired neural networks. In this work, amorphous oxide-decorated GaN nanowire arrays (GaOx@GaN NWAs) are prepared on flexible graphite paper. A GaOx@GaN NWA-based flexible device has tunable persistent photoconductivity (PPC) and shows a conversible fast/slow decay process (SDP). Photoconductivity can be modulated by single or double light pulses with different illumination powers and biases. PPC gives rise to the high-performance SDP such as a long decay time of 2.3 × 105 s. The modulation mechanism is proposed and discussed. Our results reveal an innovative and efficient strategy to produce decorated NWAs on a flexible substrate with tunable optoelectronic properties and exhibit potential for flexible neuromorphic system applications.

[Histological analysis of the anterior lobe region in transurethral prostatectomy].

OBJECTIVE: To explore the possibility of injury to the striated urethral sphincter by incision to the anterior lobe region in transurethral prostatectomy. METHODS: We incised the anterior lobe region of 60 patients with benign prostatic hyperplasia (BPH) undergoing transurethral prostatectomy. The patients were divided into four groups according to the incision fields: proximate superficial (group 1), proximate deep (group 2), distal superficial (group 3) and distal deep (group 4). The tissues taken from the anterior lobe region were subjected to HE staining, and the smooth and striated muscles were detected by immunohistochemical identification of smooth muscle actin (SMA) and myoglobin (MYO) in the tissues. The prostate volume, age, and PSA level of the patients were analyzed against their positive or negative results. The relative contents of the striated muscle were compared among groups 2, 3 and 4. The independent-sample between-group t-test was used for statistic analysis. RESULTS: The urethral rhabdosphincter was found in the anterior lobe region, with the smooth muscle intermixed with the striated muscle. The incision injury of the urethral rhabdosphincter was associated with the prostate volume. Increased urethral rhabdosphincter was observed in the anterior lobe region, approaching the apex of the prostate and extending to the urethral lumen. CONCLUSION: The anterior lobe region should not be excessively incised in transurethral prostatectomy so as to avoid direct injury of the striated urethral sphincter, which is especially important for prostates of smaller volume or operation near the apex of the prostate.

[Photoluminescence from Si and Er dual-implanted Si-rich thermal oxidation SiO2/Si thin films].

Si and Er ions were implanted into Si-rich thermal oxidation SiO2/Si thin film using metal vapor vacuum arc (MEVVA) ion source implanter, which could produce ion beams with high-fluence and strong-flux. Rutheroford backscattering spectra show that Er concentration in as-implanted sample is attained to 10 at. % corresponding to the level of 10(21) atoms.cm-3. Needle nanocrystal Si in the surface of annealed samples have been formed during ion implantation followed by rapid thermal annealing. Photoluminescence around 1.54 microns from Er-doped Si-rich thermal oxidized SiO2/Si thin film were observed at 77 K and room-temperature (RT). Light emission around the wavelength of 1.54 microns were closely related to many conditions including substrate, ion implantation and annealing etc.